Affiliation: | (1) Department of Biological Sciences, Carnegie-Mellon University, 15213 Pittsburgh, Pennsylvania;(2) Department of Chemistry, Amherst College, 01002 Amherst, Massachusetts;(3) Department of Physiology, SUNY Health Sciences Center, 13210 Syracuse, New York;(4) Present address: Department of Neurology, Johns Hopkins Medical School, 21205 Baltimore, MD;(5) Present address: Obstetrics Department, Thomas Jefferson University Hospital, 19107 Philadelphia, PA |